view src/drawMidiNotes.cpp @ 1:1a32ce016bb9

Changed bestEstimate timing to work via time sent from Max not the elapsed time. This had caused some problems, but this version now working surprisingly well on MIDI files with variable timing.

/*
 *  drawMidiNotes.cpp
 *  midiCannamReader
 *
 *  Created by Andrew on 17/07/2011.
 *  Copyright 2011 QMUL. All rights reserved.
 *
 */

#include "drawMidiNotes.h"

drawMidiNotes::drawMidiNotes(){

	
	ticksPerScreen = 8000;
	tickLocation = 0;
	pulsesPerQuarternote = 240;
	noteArrayIndex = 0;
	noteMinimum = 30;
	noteMaximum = 96;
	screenWidth = ofGetWidth();
	screenHeight = ofGetHeight();
	noteHeight = screenHeight / (float)(noteMaximum - noteMinimum);
}

void drawMidiNotes::reset(){
	noteArrayIndex = 0;
	tickLocation = 0;
	lastPeriodUpdateTime = ofGetElapsedTimeMillis();
	
}

void drawMidiNotes::updatePlayPosition(){
	double timeDifference = ofGetElapsedTimeMillis() - lastPeriodUpdateTime;
	//this is time diff in milliseconds
	//then we have 
	double quarterNoteIntervals = (timeDifference / period);
	tickLocation = quarterNoteIntervals * pulsesPerQuarternote; 

}

void drawMidiNotes::drawFile(const IntMatrix& noteOnMatrix){
	int size = noteOnMatrix.size();
	if (size > 0){

		int numberOfScreensIn = tickLocation / ticksPerScreen;
		
	while (noteArrayIndex < noteOnMatrix.size() && tickLocation > noteOnMatrix[noteArrayIndex][0] )
		noteArrayIndex++;
	
	while (noteArrayIndex > 0 && noteArrayIndex < size && tickLocation < noteOnMatrix[noteArrayIndex][0])
		noteArrayIndex--;
		
		//need to start where we currently are in file
		int maxNoteIndexToPrint	= noteArrayIndex;
		int minNoteIndexToPrint = noteArrayIndex;
		
		
		while (maxNoteIndexToPrint < noteOnMatrix.size() && noteOnMatrix[maxNoteIndexToPrint][0] < (numberOfScreensIn+1)*ticksPerScreen )
			maxNoteIndexToPrint++;
		
		while (minNoteIndexToPrint > 0 && minNoteIndexToPrint < size && noteOnMatrix[minNoteIndexToPrint][0] > numberOfScreensIn*ticksPerScreen)
			minNoteIndexToPrint--;
		
		
		for (int tmpIndex = minNoteIndexToPrint;tmpIndex < maxNoteIndexToPrint;tmpIndex++){
		int xLocation = (float)(noteOnMatrix[tmpIndex][0] - numberOfScreensIn*ticksPerScreen)*screenWidth/(float)ticksPerScreen;
			int duration = (float)(noteOnMatrix[tmpIndex][3]*screenWidth)/(float)ticksPerScreen;
			
			
		int yLocation = screenHeight - ((noteOnMatrix[tmpIndex][1] - noteMinimum )*screenHeight/ (float)(noteMaximum - noteMinimum));						 
		ofRect(xLocation,yLocation, duration,  noteHeight);
		
		}
		
			int xLocation = (float)(tickLocation - numberOfScreensIn*ticksPerScreen)*screenWidth/(float)ticksPerScreen;
		ofLine(xLocation, 0, xLocation, screenHeight);
	
	//	if (noteArrayIndex < size )
	//		printf("tick %i :: note array :%i: %i\n", tickLocation, noteArrayIndex, noteOnMatrix[noteArrayIndex][0]);
	//	else
	//		printf("end of file\n");

		
	}	
		
}